NEXAFS characterization of two-dimensional B-C-N hybrid thin films

Uddin, M. N.*; Baba, Yuji  ; Sekiguchi, Tetsuhiro  ; Nagano, Masamitsu*

Graphite-like B-C-N hybrids have been expected to control a wide variety of electronic properties from metal to insulator. However, single phase of B-C-N hybrids has not been synthesized so far. Since most B-C-N hybrids have complex structure including various unknown chemical bonding states, the local structures have not been clarified yet. We synthesized B-C-N hybrid thin films were synthesized by ion beam deposition of borazine on a graphite substrate, and characterized them by NEXAFS spectroscopy. B K-edge NEXAFS spectra showed some unknown * peaks below the * peak of h-BN. These unknown * peaks showed smaller polarization dependence than the * peak of h-BN. This suggests that local structures which correspond to the unknown peaks have a distorted configuration. To interpret this distorted configuration, some model clusters are calculated by a molecular orbital theory, and the electronic structures are compared with NEXAFS.